Fall 1999 Gems & Gemology
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Amber with Mite Inclusion
Editor Nathan Renfro Contributing Editors Elise A. Skalwold and John I. Koivula The purpose of this new quarterly column in Gems & may seem elusive, even daunting. Continual practice, care- Gemology is to encourage the appreciation of inclusions ful observation, and patience will refine both technique and in forensic gemology and to help build the observational interpretive prowess for both new and experienced inclu- skill set of the practicing gemologist. By providing concise sionists. Observation through the microscope serves as the information and vividly clear photomicrographs and pho- very foundation for many conclusions drawn on a speci- tomacrographs of new or otherwise interesting inclusion men. This can include identification, treatment detection, specimens, the column aims to narrow the knowledge gap separation of natural and synthetic materials, and geo- between advanced inclusionists and gemologists working graphic origin—even secrets of a gem’s genesis and the se- in mainstream general practice. crets of the earth’s depths may ultimately be revealed. The micro-world of gems lies at the very core of gemol- In building proficiency of the micro-world through this ogy. Sometimes its nature contributes to the allure of a column, readers will also expand their personal knowledge gem, as is the case with such coveted gems as sunstones, base and ability with a microscope. Mastery of microscopy, star sapphires, and cat’s-eye chrysoberyls. At other times combined with at least a basic grasp of mineralogy, is es- that world may seem a dreadful distraction to an otherwise sential for understanding the nature of gems and the geo- beautiful, marketable specimen. -
Geological Sukvey
DEPABTMENT OF THE IHTERIOE BULLETIN OF THE UNITED STATES GEOLOGICAL SUKVEY No. 148 WASHINGTON' G-OVEKNMENT PRINTING OFFICE 1897 UNITED STATES GEOLOGICAL SUEYEY CHARLES D. WALCOTT, 'DIRECTOR ANALYSES OF ROCKS ANALYTICAL METHODS LABORATORY OF THE UNITED STATES GEOLOGICAL SURVEY 1880 to 1896 BY F. W. CLAEKE AND W. F. HILLEBEAND WASHINGTON GOVERNMENT PRINTING OFFICE 1897 CONTENTS. Pago. Introduction, by F. W. Clarke ....'.......................................... 9 Some principles and methods of analysis applied to silicate rocks; by W. F. Hillebrand................................................................ 15 Part I. Introduction ................................................... 15 Scope of the present paper .......................................... 20 Part II. Discussion of methods ..................................i....... 22 Preparation of sample....................:.......................... 22 Specific gravity. ............................: ......--.........--... 23 Weights of sample to be employed for analysis....................... 26 Water, hygroscopic ................................ ................. 26 Water, total or combined....... ^.................................... 30 Silica, alumina, iron, etc............................................ 34 Manganese, nickel, cobalt, copper, zinc.............................. 41 Calcium and strontium...................................... ........ 43 Magnesium......................................................... 43 Barium and titanium............... .... ............................ -
Setting Stones in Metal Clay Jeanette Landenwitch
Setting Stones in Metal Clay Jeanette Landenwitch Brynmorgen Press portland, maine Copyright 2008 Brynmorgen Press Drawings Tim McCreight All rights reserved. No part of this publication may be Design, edit & layout Tim McCreight reproduced or transmitted in any form or by any means, Abby Johnston electronic or mechanical, including photocopying, Michael Deles recording, or any storage and retrieval system except Index Jamie Kingman-Rice by a reviewer who wishes to quote brief passages in connection with a review written for inclusion in a Designs of all the jewelry shown in this book belong magazine, newspaper, web posting, or broadcast. to the artists. Unless otherwise noted, photos are courtesy of the artists. ISBN 978-1-929565–29–0 Preceding page: Pendant, Hiroaki Shinonome, “Kugi” Printed in Hong Kong Fine silver, diamond. 2¼” x 1¼” Second printing Front cover: Brooch, Tim McCreight Fine silver, malachite, moonstones. 2½" by 1 ¾" For ordering and permissions, visit www. brynmorgen.com CONTENTS 1 Gemstones 9 2 Tools & Materials 17 3 Choosing the Right Setting 29 4 Bezels 41 5 Prongs 67 6 Other Setting Options 79 7 The Work Behind the Work 98 Appendix 106 Acknowledgements This book is dedicated to all artists working in metal clay. It is exciting to be part of the evolution of this wonderful material, watching as the field has developed from basics to the ad- vanced work that we are seeing today. I hope this book will encourage the creation of innovative settings, and inspire su- perior work with gemstones of all kinds. I’d like to say a special thank-you to my editor, Tim Mc- Creight, whose confidence gave me the opportunity to ex- periment and describe the stonesetting ideas I was collecting. -
Prehistoric Exploitation of Limnosilicites in Northern Hungary: Problems and Perspectives Zsolt Mester and Norbert Faragó
Archaeologia Polona, vol. 54: 2016, 1 – 5 PL ISSN 0066 - 5924 Editorial The first scientific investigations of the sources of flint in Poland were undertaken by archaeologist Stefan Krukowski and geologist Jan Samsonowicz in the early 20th century. Krukowski used archaeological materials to identify the macroscopic char- acteristics of ‘chocolate’ flints, described their differences, and showed the potential location of the deposits (Krukowski 1920: 189–195; Budziszewski 2008: 33). In the search for deposits of flint, their outcrops, and prehistoric mines, Krukowski was accompanied by young geologist Jan Samsonowicz. The result of their cooperation was the discovery in 1921 of in situ deposits and surface accumulations of limestones containing fragments of flint and, in 1922, the identification of a prehistoric mine at Krzemionki Opatowskie (Krukowski 1923; Samsonowicz 1923; Bąbel 2014). This long tradition of studying siliceous rocks has continued at the Institute of Archaeology and Ethnology, Polish Academy of Science. In 1965 Zygmunt Krzak published the first characterization of gray white-spotted (świeciechów) flint (Krzak 1965) and five years later he described Turonian flint from Ożarów (Krzak 1970). In 1971 Romuald Schild devised a classification of ‘chocolate’ flint from the north-east margin of the Holy Cross (Świątokrzyskie) Mountains (Schild 1971, 1976) and Bogdan Balcer investigated a flint mine in Świeciechów, Kraśnik district, and the use of gray white-spotted (świeciechów) flint during the Neolithic (Balcer 1975, 1976). In 1980 Jacek Lech discussed the geology of Jurassic-Cracow flint and showed its relevance to archaeology (Lech 1980). Since that time Polish archeologists have carried out many investigations on different types of flint (e.g., Budziszewski and Michniak 1983/1989; Pawlikowski 1989; Budziszewski and Michinak eds 1995; Schild and Sulgostowska eds 1997; Matraszek and Sałaciński eds 2002; Gutowski 2004; Borkowski et al., 2008; Migaszewski et al., 2006, Krajcarz et al., 2014). -
Phenomenal Gemstones Possess Striking Optical Effects, Making Them Truly a Sight for Sore Eyes
THE PHENOMENAL PROPERTIES OF GEMS Phenomenal gemstones possess striking optical effects, making them truly a sight for sore eyes. Here is GIA’s guide to understanding what makes each phenomenon so uniquely brilliant. ASTERISM CROSSING BANDS OF REFLECTED LIGHT CREATE A SIX-RAYED STAR-LIKE APPEARANCE. ASTERISM OCCURS IN THE DOME OF A CABOCHON, AND CAN BE SEEN IN GEMS LIKE RUBIES AND SAPPHIRES. ADULARESCENCE THE SAME SCATTERING OF LIGHT THAT MAKES THE SKY BLUE CREATES A MILKY, BLUISH-WHITE GLOW, LIKE MOONLIGHT SHINING THROUGH A VEIL OF CLOUDS. MOONSTONE IS THE ONLY GEM THAT DISPLAYS IT. AVENTURESCENCE FOUND IN NATURAL GEMS LIKE SUNSTONE FELDSPAR AND AVENTURINE QUARTZ, IT DISPLAYS A GLITTERY EFFECT CAUSED BY LIGHT REFLECTING FROM SMALL, FLAT INCLUSIONS. CHATOYANCY OTHERWISE KNOWN AS THE “CAT’S EYE” EFFECT, BANDS OF LIGHT ARE CAUSED BY THE REFLECTION OF LIGHT FROM MANY PARALLEL, NEEDLE-LIKE INCLUSIONS INSIDE A CABOCHON. NOTABLE GEMS THAT DISPLAY CHATOYANCY INCLUDE CAT’S EYE TOURMALINE AND CAT’S EYE CHRYSOBERYL. IRIDESCENCE ALSO SEEN IN SOAP BUBBLES AND OIL SLICKS, IT’S A RAINBOW EFFECT THAT IS CREATED WHEN LIGHT IS BROKEN UP INTO DIFFERENT COLORS. LOOK FOR IT IN FIRE AGATE AND OPAL AMMONITE (KNOWN BY THE TRADE AS AMMOLITE). LABR ADORESCENCE A BROAD FLASH OF COLOR THAT APPEARS IN LABRADORITE FELDSPAR, IT’S CAUSED BY LIGHT INTERACTING WITH THIN LAYERS IN THE STONE, AND DISAPPEARS WHEN THE GEM IS MOVED. INSIDER’S TIP: THE MOST COMMON PHENOMENAL COLOR IN LABRADORITE IS BLUE. PLAY OF COLOR THE FLASHING RAINBOW-LIKE COLORS IN OPAL THAT FLASH AT YOU AS YOU TURN THE STONE OR MOVE AROUND IT. -
Lightning Strikes As a Major Facilitator of Prebiotic Phosphorus Reduction on Early Earth ✉ Benjamin L
ARTICLE https://doi.org/10.1038/s41467-021-21849-2 OPEN Lightning strikes as a major facilitator of prebiotic phosphorus reduction on early Earth ✉ Benjamin L. Hess 1,2,3 , Sandra Piazolo 2 & Jason Harvey2 When hydrated, phosphides such as the mineral schreibersite, (Fe,Ni)3P, allow for the synthesis of important phosphorus-bearing organic compounds. Such phosphides are com- mon accessory minerals in meteorites; consequently, meteorites are proposed to be a main 1234567890():,; source of prebiotic reactive phosphorus on early Earth. Here, we propose an alternative source for widespread phosphorus reduction, arguing that lightning strikes on early Earth potentially formed 10–1000 kg of phosphide and 100–10,000 kg of phosphite and hypo- phosphite annually. Therefore, lightning could have been a significant source of prebiotic, reactive phosphorus which would have been concentrated on landmasses in tropical regions. Lightning strikes could likewise provide a continual source of prebiotic reactive phosphorus independent of meteorite flux on other Earth-like planets, potentially facilitating the emer- gence of terrestrial life indefinitely. 1 Department of Earth and Planetary Sciences, Yale University, New Haven, CT, USA. 2 School of Earth and Environment, Institute of Geophysics and Tectonics, The University of Leeds, Leeds, UK. 3 Department of Geology and Environmental Science, Wheaton College, Wheaton, IL, USA. ✉ email: [email protected] NATURE COMMUNICATIONS | (2021) 12:1535 | https://doi.org/10.1038/s41467-021-21849-2 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-021-21849-2 ife on Earth likely originated by 3.5 Ga1 with carbon isotopic Levidence suggesting as early as 3.8–4.1 Ga2,3. -
Tigers Eye Free
FREE TIGERS EYE PDF Karen Robards | 400 pages | 11 May 2010 | HarperCollins Publishers Inc | 9780380755554 | English | New York, United States Tigers Eye Stone Meaning & Uses: Aids Harmonious Balanced Action Tiger's eye also called tiger eye is a Tigers Eye gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre. As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite. Tiger iron is an altered rock composed chiefly of tiger's eye, red jasper and black hematite. The undulating, contrasting bands of colour and lustre make for an attractive motif and it is Tigers Eye used for Tigers Eye and ornamentation. Tiger iron is a popular ornamental material Tigers Eye in a variety of applications, from beads to knife hilts. Tiger iron is mined primarily in South Africa and Western Australia. Tiger's eye is composed chiefly of silicon dioxide SiO 2 and is coloured mainly by Tigers Eye oxide. The specific gravity ranges from 2. Serpentine deposits in which are occasionally found chatoyant bands of chrysotile fibres have been found in the US states of Arizona and California. These have been cut and sold as "Arizona tiger-eye" and "California tiger's eye" gemstones. In some parts of the world, the stone is believed to ward off the evil eye. Gems are usually given a cabochon cut to best display their chatoyance. -
The Blue Star Sapphire
THE BLUE STAR SAPPHIRE Summary Item: Gemstone Species: Natural Corundum Variety: Star Sapphire Carats: 530 Origin: Sri Lanka Color: Blue Transparency: Transparent Enhancements: None Certificate: Gubelin Gemmological Laboratory Characteristics This magnificent specimen is an extremely rare and priceless gemstone. It was originally purchased in 1971 in Southern Sri Lanka from a gemstone dealer in the Hikkaduwa Region. It was unearthed from Sri Lankan soil, refined, and then protected for generations by a solitary family since 1971. The stone has been certified by Gubelin labs of Switzerland and inspected by the respected representatives of the Gem Corporation of Sri Lanka. What makes it so unique is the combination of exceptional color, transparency, saturation and display of distinct asterism. These qualities are more brilliant than any of the other known large 1 star sapphires. Phenomena Star sapphires are a type of sapphire that exhibit a star-like phenomenon known as asterism. These gemstones contain intersecting needle-like silk inclusions (often the mineral rutile, a mineral composed primarily of titanium dioxide) that cause the appearance of a six-rayed 'star'-shaped pattern that reflect and scatter light. This gemstone has a clear and centered “asterism”. Size At 530 carats it is second only to the Star of India1 the largest and most famous blue star sapphire in the world and currently part of the New York Museum of Natural History’s Morgan-Tiffany collection. Shape Its oval shape and double cabochon is perfectly proportioned and rounded seems to dwarf other notable large blue star sapphires such as the Star of Sri Lanka1 at 383 carats and 182 carats Star of Bombay1. -
A Case Study: Tiffany &
F I R S T M E D I A Design Management Paper A CASE STUDY: TIFFANY & CO. PREPARED BY: TAN PEI LING DAPHNE TAN SHU MIN Introduction Tiffany & Co. (henceforth referred as “Tiffany”) is America’s premier purveyor of jewels and time- pieces, as well as luxury table, personal and household accessories. Founded in 1837 by Charles Lewis Tif- fany, Tiffany’s design philosophy has been based mainly on the central tenet that “good design is good busi- ness”1. All Tiffany’s designs are presented in the Tiffany Blue Box, recognized around the world as an icon of distinction and a symbol of the ultimate gift to celebrate life’s most joyous occasions. Today, the company’s 100 plus boutiques in 17 counties continue the company’s tradition of excellence2. This paper consists of several segments: (1) brief history of Tiffany; (2) organizational structure of the company; (3) marketing and product attributes; (4) target audience; (5) the unique selling proposition of its products; before concluding the paper. Brief History of Tiffany: 1837, Tiffany & Young is established Tiffany & Co. is a U.S. jewellery and silverware company founded by Charles Lewis Tiffany and Teddy Young in New York City in 1837 as a “stationery and fancy goods emporium.” The store initially sold a wide variety of stationery items, and operated as Tiffany, Young and Ellis in lower Manhattan. The name was shortened to Tiffany & Co in 1853 when Charles Tiffany took control, and the firm’s emphasis on jewel- lery was established. Tiffany & Co. has since opened stores in major cities all over the world. -
AFMS Merit Badges
AMERICAN FEDERATION OF MINERALOGICAL SOCIETIES Future Rockhounds of America Badge Program Fourth Edition Jim Brace-Thompson AFMS Juniors Program Chair [email protected] (805) 659-3577 This packet is available on-line on the AFMS website: www.amfed.org © 2004, 2008, 2010, 2012, 2016 Jim Brace-Thompson & the American Federation of Mineralogical Societies AMERICAN FEDERATION OF MINERALOGICAL SOCIETIES Future Rockhounds of America Badge Program MISSION STATEMENT Future Rockhounds of America is a nationwide nonprofit program within the American Federation of Mineralogical Societies that develops and delivers quality youth activities in the earth sciences and lapidary arts in a fun, family environment. Our underlying goals are to foster science literacy and arts education through structured activities that are engaging and challenging and by which kids—and the adults who mentor them—learn while having fun. INTRODUCTION . Philosophy behind the FRA Badge Program & Suggestions on Using It I’ve developed this manual so as to enable the American Federation of Mineralogical Societies to sponsor a youth program via Future Rockhounds of America, a program that rewards kids on an on-going basis as a means of encouraging and cultivating their interest in the earth sciences and lapidary arts. Through this, each of our individual clubs and societies will uphold our chartered goals as nonprofit, educational organizations by actively seeking to foster and develop science literacy and arts education amongst our youngest members. My guiding philosophy has three underpinnings. They come from both my own values as a person invested in the positive development of young people and from a wealth of academic research indicating that if one wants to design and deliver programs that effectively promote positive development among young people, three steps are crucial to enact. -
Jza Magazine Issue 2021
Officially endorsed by the Jewellery Council of South Africa (JCSA) Regency Rocks 2021 AUTUMN Magical win charms with Tsogo Sun Silver Linings Storybook Now serving fabulousness! Photo by Karina Tess on Unsplash All that glitters . and more Subscribe for FREE! Email your full name and contact number to [email protected] 2 Of course, in a world which is frequently resetting itself – A note from the regardless of season – and in which we ourselves search for different ways to re-emerge, EDITOR- colour is a welcome tonic for the body, mind and soul. So the canvas of the storybook IN-CHIEF you're about to feast your eyes upon has been painted with passion, life, love and even laughter. Our paintbrush Saturday, 20 March is the is called “jewellery” and it’s all in colour! autumnal equinox in South Africa. And Team JZA is rather delighted Across the blue seas, we welcome Smitha Sadanandan as that this issue not only echoes our Editor-at-Large, who reminded me: “It doesn’t matter if the spectrum of the season’s it’s autumn – who doesn’t like ice-cream!?” gorgeous hues of gold, orange, And on that note, enjoy our serving of fabulousness! yellow, burgundy and brown, but pays equal attention to the rest of nature’s wonderful palette. Although, with the autumn breezes in the air, we might sway over a little to the odd Editor-in-Chief favourite or two (or three)… Jason Aarons Smitha Sadanandan Adri Viviers Gill Hyslop JZA's Editor-at-Large is Chicago- Adri is Editor of JZA’s sister Gill has been in the publishing based Smitha – a freelance magazine, SA Jewellery News industry for more than 30 years, journalist specialising in the (SAJN), the official publication of having worked on numerous B2B luxury industry. -
Star Stones (Asterism)
Learning Series: Basic Rockhound Knowledge Star Stones (Asterism) When parallel, needle-like inclusions, or tube-like channels, are oriented along two or more of the crystal faces of a mineral, and when that stone is cut as a domed cabochon, a four- to six-rayed figure is displayed on the dome. This phenomenon of reflected light is called "asterism" and the gems are called star stones. The most commonly seen examples are star corundums; where there are inclusions of titanium oxide (rutile or "silk") parallel to three crystal faces giving a six-rayed star. In rare cases, a twinned crystal slightly offset with its own set of rutile needles can lead to the formation of a twelve-rayed star. Although rutile is an extremely common inclusion in sapphire, few good, natural, star sapphires are found. One of the major reasons is that the heating, which is almost universally done to sapphire rough, dissolves rutile needles; clarifying and sometimes color enhancing the stone, yes, but eliminating potential stars! [Rutile needles (silk) aligned in three directions in unheated corundum] [Star ruby, white star sapphire ring, rare bi-colored star sapphire] The only other gem which commonly forms stars is quartz, where the phenomenon tends to be more visible in transmitted than in reflected light. In this species, rose quartz is the most frequently asterated variety. Most citrine in commerce has been heated, which tends to dissolve the fine rutile inclusions necessary for star formation, so it is rather rare. In fine, near-transparent quartzes which have been cut to a spherical shape, multiple stars can form an intersecting pattern over the surface.